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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Cash flows from operating activities: |  |
Net income | $ 241,621 | $ 186,533
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 46,095 | 32,355
Operating lease right-of-use assets amortization expense | 50,467 | 40,203
Bad debt expense | 2,794 | 133
Deferred taxes | (4,546) | (3,105)
Stock-based compensation expense | 54,794 | 53,024
Other | 3,225 | 7,522
Changes in assets and liabilities: |  |
Trade receivables and contract assets | 3,477 | (77,833)
Prepaid and other assets | 4,261 | 237
Accounts payable | 1,836 | (1,844)
Accrued expenses and other liabilities | 30,787 | (11,230)
Operating lease liabilities | (47,023) | (39,230)
Income taxes payable | (2,813) | (23,899)
Net cash provided by operating activities | 384,975 | 162,866
Cash flows from investing activities: |  |
Purchases of property and equipment | (50,311) | (52,295)
Purchases of short-term investments | (60,000) | 0
Acquisition of business, net of cash acquired (Note 2) | (18,888) | (28,655)
Purchases of non-marketable securities | (20,500) | (5,000)
Other investing activities, net | 452 | (1,632)
Net cash used in investing activities | (149,247) | (87,582)
Cash flows from financing activities: |  |
Proceeds from stock option exercises | 23,027 | 28,798
Payments of withholding taxes related to net share settlements of restricted stock units | (16,213) | (14,521)
Payment of contingent consideration for previously acquired business | (7,869) | (1,104)
Other financing activities, net | (28) | (26)
Net cash (used in)/provided by financing activities | (1,083) | 13,147
Effect of exchange rate changes on cash, cash equivalents and restricted cash | (10,110) | (5,753)
Net increase in cash, cash equivalents and restricted cash | 224,535 | 82,678
Cash, cash equivalents and restricted cash, beginning of period | 937,688 | 771,711
Cash, cash equivalents and restricted cash, end of period | $ 1,162,223 | $ 854,389

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition Amount of cash outflow to acquire investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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